US PATENT SUBCLASS 379 / 304
.~.~.~ All relay type

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
258  DF  .~ Switching controlled in response to called station addressing signal {9}
298  DF  .~.~ Direct control {3}
304.~.~.~ All relay type

DEFINITION

Classification: 379/304

All relay type:

(under subclass 298) Subject matter in which all switching is performed by electromagnetically controlled contact apparatus.

SEE OR SEARCH CLASS

340, Communications: Electrical,

825.79, for a relay matrix.

361, Electricity: Electrical Systems and Devices,

139+, for a relay control circuit.